Istituto Nazionale di Geofisica e Vulcanologia

Earthquake with magnitude of ML 1.7 on date 23-04-2023 and time 21:55:15 (Italy) in region 1 km W Ussita (MC)

A magnitude ML 1.7 earthquake occured in region: 1 km W Ussita (MC), on

  • 23-04-2023 19:55:15 (UTC)
  • 23-04-2023 21:55:15 (UTC +02:00) Italian time

and geographic coordinates (lat, lon) 42.9450, 13.1240 at 10 km depth.

The earthquake was located by: Bollettino Sismico Italiano INGV.

Search earthquakes: Any within 30 km radius

The values of hypocentral coordinates and magnitude may be revised at a later time as more information becomes available.

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Municipalities within 20 km from the epicenter

Distances are determinated based on the geographic coordintes of the (Istat).
Municipality Region Dist Inh Cum Inh
Ussita MC 1 444 444
Visso MC 3 1107 1551
Castelsantangelo sul Nera MC 6 281 1832
Preci PG 10 724 2556
Bolognola MC 10 142 2698
Acquacanina MC 10 121 2819
Fiastra MC 11 559 3378
Fiordimonte MC 11 202 3580
Monte Cavallo MC 11 145 3725
Pieve Torina MC 13 1458 5183
Pievebovigliana MC 14 866 6049
Muccia MC 17 915 6964
Norcia PG 17 4957 11921
Sellano PG 17 1079 13000
Montemonaco AP 17 604 13604
Sarnano MC 18 3264 16868
Montefortino FM 18 1178 18046
Amandola FM 19 3629 21675
Serravalle di Chienti MC 20 1070 22745

Municipalities with at least 50000 inhabitants

An earthquake occurred to
34 Km E of Foligno (57155 inhabitants)
57 Km NW of Teramo (54892 inhabitants)
58 Km NE of Terni (111501 inhabitants)
62 Km E of Perugia (166134 inhabitants)
70 Km NW of L'Aquila (69753 inhabitants)
81 Km SW of Ancona (100861 inhabitants)
97 Km NW of Montesilvano (53738 inhabitants)
100 Km S of Fano (60888 inhabitants)
Recent and historical seismicity
Seismic hazard
Shakemap
Felt maps
Locations history
Type Magnitude Date and Time (UTC) Latitude Longitude Depth (km) Published time (UTC) Author Location ID
Bulletin
Rev1000 		ML 1.7 2023-04-23
19:55:15		 42.9453 13.1242 10 2024-03-01
17:18:07		 Bollettino Sismico Italiano INGV 117146391
Reviewed
Rev100 		ML 1.6 2023-04-23
19:55:15		 42.9422 13.1202 11 2023-04-23
20:01:46		 Sala Sismica INGV-Roma 116665481
Preferred location and magnitude until now.
Origin information

Origin

Field Value
Time (UTC) 2023-04-23 19:55:15 ± 0.03
Latitude 42.9453 ± 0.0018
Longitude 13.1242 ± 0.0025
Depth (km) 10 ± 0 (from location)
Evaluation mode of Origin manual
Evaluation status of Origin reviewed
Version 1000 -> BULLETIN-INGV
Event type earthquake
Origin ID 117146391

Uncertainty

Field Value
Preferred uncertainty description uncertainty ellipse
Semi-major axis of confidence ellipse (meter) 252
Semi-minor axis of confidence ellipse (meter) 77
Azimuth of major axis of confidence ellipse. Measured clockwise from South-North direction at epicenter (gradi) 59
Circular confidence region, given by single value of horizontal uncertainty (meter) 250.0
Confidence level of the uncertainty (%) 68

Quality

Field Value
Largest azimuthal gap in station distribution as seen from epicenter (degree) 56
Number of associated phases, regardless of their use for origin computation 65
Number of defining phases 65
RMS of the travel time residuals of the arrivals used for the origin computation (sec) 0.21
Epicentral distance of station closest to the epicenter (degree) 0.05666
Epicentral distance of station farthest from the epicenter (degree) 0.77342
Number of stations at which the event was observed 37
Number of stations from which data was used for origin computation 37
Magnitudes information

ML:1.7

Field Value
Value 1.7
Uncertainty 0.3
Num. used stations 52
Type of magnitude ML
Reference to an origin 117146391
Agency INGV
Autore Bollettino Sismico Italiano INGV
Time of creation (UTC) 2024-02-09 16:08:45

ML:1.6

Field Value
Value 1.6
Uncertainty 0.3
Num. used stations 52
Type of magnitude ML
Reference to an origin 116665481
Agency INGV
Autore Sala Sismica INGV-Roma
Time of creation (UTC) 2023-04-23 20:01:46
Picking and Arrival
SCNL Time Uncertainty Polarity Evaluation_mode Phase Azimuth Distance(km) Takeoff_angle Residual Weight
IV.ARVD.HHZ. 2023-04-23T19:55:35.80 0.3 undecidable manual S 347 63.0924 50 0.57 61
IV.CESX.HHZ. 2023-04-23T19:55:33.80 0.3 undecidable manual S 230 57.498 50 0.05 69
IV.TERO.HHZ. 2023-04-23T19:55:32.80 0.1 undecidable manual S 132 53.0025 50 0.26 89
IV.RM33.EHZ. 2023-04-23T19:55:31.70 0.6 undecidable manual S 171 48.9177 50 0.24 45
IV.CAMP.HHZ. 2023-04-23T19:55:31.90 0.1 undecidable manual S 153 51.0156 50 -0.11 92
IV.ATCC.EHZ. 2023-04-23T19:55:31.40 0.6 undecidable manual S 304 47.4192 50 0.35 44
IV.FOSV.EHZ. 2023-04-23T19:55:31.50 0.6 undecidable manual S 323 48.618 50 0.12 46
IV.NARO.HHZ. 2023-04-23T19:55:30.44 0.1 undecidable manual P 329 85.8474 50 -0.08 87
IV.EL6.EHZ. 2023-04-23T19:55:30.20 0.6 undecidable manual S 358 42.624 50 0.43 44
IV.PIEI.HHZ. 2023-04-23T19:55:29.63 0.3 undecidable manual P 324 80.9523 50 -0.13 65
IV.LNSS.HHZ. 2023-04-23T19:55:28.70 0.1 undecidable manual S 190 38.628 50 0.01 96
IV.SNTG.HHZ. 2023-04-23T19:55:28.50 0.6 undecidable manual S 337 37.4292 50 0.11 47
IV.SMA1.EHZ. 2023-04-23T19:55:28.40 0.3 undecidable manual S 154 38.9277 50 -0.38 67
IV.ASSB.HHZ. 2023-04-23T19:55:28.80 0.6 undecidable manual S 286 39.2274 50 -0.08 47
IV.ATVO.HHZ. 2023-04-23T19:55:28.74 0.1 undecidable manual P 310 75.6687 50 -0.19 87
IV.GIGS.HHZ. 2023-04-23T19:55:27.29 1.0 negative manual P 146 65.6898 50 -0.12 22
IV.GAG1.HNE. 2023-04-23T19:55:27.06 0.6 undecidable manual S 352 32.8449 50 -0.09 48
IV.SAP2.EHE. 2023-04-23T19:55:26.39 0.6 undecidable manual S 53 27.9498 50 0.54 44
IV.CESX.HHZ. 2023-04-23T19:55:26.66 0.1 undecidable manual P 230 57.498 50 0.51 84
IV.ARVD.HHZ. 2023-04-23T19:55:26.96 0.6 undecidable manual P 347 63.0924 50 -0.04 46
IV.MF5.EHN. 2023-04-23T19:55:26.38 0.6 undecidable manual S 80 27.6501 50 0.61 42
IV.SSFR.HHZ. 2023-04-23T19:55:26.24 0.3 undecidable manual P 333 61.0944 50 -0.45 63
IV.ARRO.EHZ. 2023-04-23T19:55:25.12 0.1 undecidable manual P 216 50.0166 50 0.13 92
IV.SEF1.HNN. 2023-04-23T19:55:25.21 0.6 undecidable manual S 327 26.5512 50 -0.27 47
IV.TERO.HHZ. 2023-04-23T19:55:25.51 0.1 undecidable manual P 132 53.0025 50 0.06 93
IV.RM33.EHZ. 2023-04-23T19:55:24.65 0.3 undecidable manual P 171 48.9177 50 -0.18 69
IV.CAMP.HHZ. 2023-04-23T19:55:24.97 0.1 undecidable manual P 153 51.0156 50 -0.17 91
IV.MML1.EHZ. 2023-04-23T19:55:24.11 0.6 undecidable manual S 327 22.3554 115 -0.19 48
IV.ATCC.EHZ. 2023-04-23T19:55:24.56 0.1 undecidable manual P 304 47.4192 50 -0.03 95
IV.FOSV.EHZ. 2023-04-23T19:55:24.60 0.1 undecidable manual P 323 48.618 50 -0.18 91
IV.GUMA.HHZ. 2023-04-23T19:55:24.30 0.1 undecidable manual S 53 21.5673 116 0.27 94
IV.CESI.HHZ. 2023-04-23T19:55:23.30 0.6 undecidable manual S 290 18.9699 118 0.04 50
IV.SMA1.EHZ. 2023-04-23T19:55:23.01 0.1 undecidable manual P 154 38.9277 50 -0.27 91
IV.PF6.EHN. 2023-04-23T19:55:23.80 0.6 undecidable manual S 15 22.0668 115 -0.42 46
IV.EL6.EHZ. 2023-04-23T19:55:23.67 0.1 undecidable manual P 358 42.624 50 -0.18 92
IV.LNSS.HHZ. 2023-04-23T19:55:23.09 0.1 undecidable manual P 190 38.628 50 -0.13 94
IV.ASSB.HHZ. 2023-04-23T19:55:22.89 0.1 undecidable manual P 286 39.2274 50 -0.44 88
IV.GAG1.HNE. 2023-04-23T19:55:22.23 0.3 undecidable manual P 352 32.8449 50 -0.11 72
IV.MTRA.EHE. 2023-04-23T19:55:22.52 0.1 undecidable manual P 133 30.4473 50 0.55 87
IV.MMO1.EHZ. 2023-04-23T19:55:22.50 0.1 undecidable manual S 107 17.2716 121 -0.22 96
IV.CSP1.EHE. 2023-04-23T19:55:22.70 0.6 undecidable manual S 22 17.5713 120 -0.1 49
IV.SNTG.HHZ. 2023-04-23T19:55:22.82 0.1 undecidable manual P 337 37.4292 50 -0.23 92
IV.GAVE.EHN. 2023-04-23T19:55:22.52 0.3 undecidable manual P 214 33.744 50 0.04 72
7F.SIB2.EHE. 2023-04-23T19:55:22.00 0.6 undecidable manual S 112 15.7731 123 -0.29 47
IV.FDMO.HHN. 2023-04-23T19:55:21.00 0.6 undecidable manual S 344 10.5783 134 0.13 49
IV.NRCA.HNZ. 2023-04-23T19:55:21.30 0.1 undecidable manual S 184 12.3765 130 -0.05 100
7F.SIB3.EHN. 2023-04-23T19:55:21.70 0.6 undecidable manual S 123 14.1747 126 -0.13 49
IT.MTCL.HGZ. 2023-04-23T19:55:21.30 0.6 undecidable manual S 298 11.4774 132 0.2 49
IV.FIU1.HNZ. 2023-04-23T19:55:21.95 0.3 undecidable manual P 330 31.1466 50 -0.13 71
IV.MF5.EHN. 2023-04-23T19:55:21.74 0.3 undecidable manual P 80 27.6501 50 0.2 71
IV.SEF1.HNN. 2023-04-23T19:55:21.35 0.3 undecidable manual P 327 26.5512 50 -0.02 74
IV.SAP2.EHE. 2023-04-23T19:55:21.31 0.6 undecidable manual P 53 27.9498 50 -0.27 47
IV.GUMA.HHZ. 2023-04-23T19:55:20.64 0.1 undecidable manual P 53 21.5673 116 0.11 97
IV.MML1.EHZ. 2023-04-23T19:55:20.59 0.1 undecidable manual P 327 22.3554 115 -0.1 97
IV.PF6.EHN. 2023-04-23T19:55:20.39 0.1 undecidable manual P 15 22.0668 115 -0.25 94
IV.FEMA.HNZ. 2023-04-23T19:55:20.30 0.6 undecidable manual S 287 6.2937 148 0.35 47
IV.CESI.HHZ. 2023-04-23T19:55:20.20 0.1 negative manual P 290 18.9699 118 0.12 98
IT.MTCL.HGZ. 2023-04-23T19:55:19.05 0.1 negative manual P 298 11.4774 132 0.2 97
IV.CSP1.EHE. 2023-04-23T19:55:19.78 0.1 undecidable manual P 22 17.5713 120 -0.05 99
7F.SIB3.EHN. 2023-04-23T19:55:19.23 0.1 undecidable manual P 123 14.1747 126 -0.04 100
IV.MMO1.EHZ. 2023-04-23T19:55:19.72 0.1 positive manual P 107 17.2716 121 -0.06 99
7F.SIB2.EHE. 2023-04-23T19:55:19.50 0.1 undecidable manual P 112 15.7731 123 -0.03 100
IV.NRCA.HNZ. 2023-04-23T19:55:19.16 0.1 positive manual P 184 12.3765 130 0.17 98
IV.FDMO.HHN. 2023-04-23T19:55:18.86 0.1 undecidable manual P 344 10.5783 134 0.15 98
IV.FEMA.HNZ. 2023-04-23T19:55:18.71 0.6 undecidable manual P 287 6.2937 148 0.54 45
Station Magnitude and Amplitude
SCNL mag Generic_amplitude Period Type Category Unit Time_window_reference
IV.FEMA.HNN. ML:2.0 0.0017150000000000002 0.44 AML other m 2023-04-23T19:55:20.83
IV.FEMA.HNE. ML:2.0 0.00168 0.46 AML other m 2023-04-23T19:55:20.96
IV.NRCA.HHN. ML:2.4 0.0026399999999999996 0.1 AML other m 2023-04-23T19:55:21.51
IV.NRCA.HNN. ML:2.4 0.0024649999999999997 0.1 AML other m 2023-04-23T19:55:21.51
IT.MTCL.HGE. ML:4.2 0.1945 0.06 AML other m 2023-04-23T19:55:21.65
IT.MTCL.HGN. ML:4.1 0.1395 0.52 AML other m 2023-04-23T19:55:21.54
IV.NRCA.HHE. ML:2.5 0.00325 0.12 AML other m 2023-04-23T19:55:21.98
IV.NRCA.HNE. ML:2.4 0.003 0.12 AML other m 2023-04-23T19:55:21.98
IV.MMO1.EHE. ML:1.9 0.0007424999999999999 0.26 AML other m 2023-04-23T19:55:22.67
IV.MMO1.EHN. ML:1.7 0.000435 1.62 AML other m 2023-04-23T19:55:22.98
IV.CESI.HHE. ML:1.8 0.0004735 0.38 AML other m 2023-04-23T19:55:23.83
IV.CESI.HHN. ML:2.0 0.000891 0.32 AML other m 2023-04-23T19:55:23.86
IV.MML1.EHN. ML:1.8 0.0004625 0.2 AML other m 2023-04-23T19:55:24.51
IV.GUMA.HHE. ML:1.9 0.000624 0.58 AML other m 2023-04-23T19:55:24.55
IV.MML1.HNE. ML:1.6 0.00028649999999999997 1.14 AML other m 2023-04-23T19:55:24.13
IV.MML1.EHE. ML:1.6 0.00029200000000000005 1.16 AML other m 2023-04-23T19:55:24.13
IV.GUMA.HNN. ML:2.0 0.0007019999999999999 0.54 AML other m 2023-04-23T19:55:24.81
IV.GUMA.HHN. ML:1.9 0.0005555 0.54 AML other m 2023-04-23T19:55:24.83
IV.MML1.HNN. ML:1.8 0.0004555 0.9 AML other m 2023-04-23T19:55:24.50
IV.GUMA.HNE. ML:1.8 0.00046350000000000004 0.34 AML other m 2023-04-23T19:55:26.23
IV.LNSS.HHE. ML:1.8 0.00022199999999999998 0.14 AML other m 2023-04-23T19:55:29.19
IV.SNTG.HHE. ML:1.5 0.000121 0.1 AML other m 2023-04-23T19:55:29.34
IV.SMA1.EHE. ML:1.7 0.00016450000000000001 0.58 AML other m 2023-04-23T19:55:29.38
IV.ASSB.HHN. ML:1.5 0.000108 0.4 AML other m 2023-04-23T19:55:29.24
IV.SNTG.HHN. ML:1.4 0.0000927 0.96 AML other m 2023-04-23T19:55:29.52
IV.ASSB.HHE. ML:1.4 0.0000875 0.1 AML other m 2023-04-23T19:55:29.58
IV.SMA1.EHN. ML:1.7 0.000183 0.68 AML other m 2023-04-23T19:55:30.23
IV.LNSS.HHN. ML:1.8 0.000208 1.18 AML other m 2023-04-23T19:55:30.24
IV.EL6.EHN. ML:1.7 0.0001705 0.78 AML other m 2023-04-23T19:55:30.55
IV.EL6.EHE. ML:1.6 0.00014150000000000002 0.16 AML other m 2023-04-23T19:55:31.25
IV.ATCC.EHE. ML:1.5 0.00009409999999999998 1.68 AML other m 2023-04-23T19:55:32.15
IV.FOSV.EHN. ML:1.5 0.00008340000000000001 0.52 AML other m 2023-04-23T19:55:32.01
IV.FOSV.EHE. ML:1.6 0.00009715 0.94 AML other m 2023-04-23T19:55:32.87
IV.RM33.EHN. ML:1.6 0.00010085 0.8 AML other m 2023-04-23T19:55:32.95
IV.ARRO.EHE. ML:1.2 0.0000468 0.48 AML other m 2023-04-23T19:55:32.91
IV.CAMP.HHN. ML:1.6 0.0000924 1.04 AML other m 2023-04-23T19:55:33.65
IV.CAMP.HHE. ML:1.4 0.0000689 0.86 AML other m 2023-04-23T19:55:33.57
IV.TERO.HHN. ML:1.6 0.000089856545 0.0768 AML other m 2023-04-23T19:55:33.15
IV.ATCC.EHN. ML:1.5 0.0000788 0.48 AML other m 2023-04-23T19:55:33.23
IV.ARRO.EHN. ML:1.2 0.00004645 0.66 AML other m 2023-04-23T19:55:33.88
IV.TERO.HHE. ML:1.6 0.00008670173 0.1408 AML other m 2023-04-23T19:55:33.95
IV.RM33.EHE. ML:1.5 0.00007994999999999999 0.42 AML other m 2023-04-23T19:55:34.20
IV.CESX.HHN. ML:1.2 0.00003725 0.74 AML other m 2023-04-23T19:55:35.65
IV.SSFR.HHE. ML:1.7 0.0001075 0.66 AML other m 2023-04-23T19:55:36.34
IV.ARVD.HHE. ML:1.3 0.00004195 0.96 AML other m 2023-04-23T19:55:36.85
IV.SSFR.HHN. ML:1.8 0.000133 0.16 AML other m 2023-04-23T19:55:36.34
IV.ARVD.HHN. ML:1.1 0.000025 0.58 AML other m 2023-04-23T19:55:36.77
IV.GIGS.HHE. ML:1.1 0.00002295 1.44 AML other m 2023-04-23T19:55:36.03
IV.GIGS.HHN. ML:1.0 0.000022 0.2 AML other m 2023-04-23T19:55:36.95
IV.CESX.HHE. ML:1.1 0.00002915 1.22 AML other m 2023-04-23T19:55:38.36
IV.PIEI.HHN. ML:1.2 0.000019950000000000004 0.38 AML other m 2023-04-23T19:55:42.75
IV.PIEI.HHE. ML:1.5 0.000041599999999999995 0.5 AML other m 2023-04-23T19:55:43.21
TDMT - Time Domain Moment Tensor
Fault Plane solutions in the area
Download
Type Description Link
QuakeML - small Event, Origin, FocalMechanism Download
QuakeML - full Event, Origin, FocalMechanism, Amplitude, Arrival, Pick, Station Magnitude Download